[SIG-40738] convert binary array to string array

[Yifeng-Sigma]

We've seen sentry error on staging when arrow batch is enabled

https://sigma-computing.sentry.io/issues/4381126171/?alert_rule_id=10811375&alert_type=issue&project=6305692&referrer=slack

error is thrown here

                // ArrayType, VariantType, ObjectType, etc...
                (_, Variant, DataType::Utf8 | DataType::Binary) => {
                    let c = Column::Json(StringArray::from(a.data().clone()));
                    Ok((Variant, c))
                }

caused by

in QLC stack we only support string array. We have to convert non-UTF8 to string array.